2

Yes:
Dance/movement/expressive therapy uses movement to improve mental & physical well-being by focus on the mind-body connection. Numerous dances including the cha cha slide are great, especially if guided by a knowledgeable instructor. It is important to approach dance in a non-stressful manner to achieve stress reduction, improve health, and greater self-confidence. Enjoy!
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4

Depends:
A faster dance can burn off quite a bit but it depends on how long you are involved in the activity avery active dancer can burn considerable calories however I have not seen data on calories for different dance styles.
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5

Can't hurt:
But watching your caloric intake would probably make more sense. Loosing weight is a balance of caloric intake and caloric burn, and i don't think the cha cha qualifies for an extreme cardio workout.
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10

Here are some ...:
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